Pulley-block.



A. SMITH.

PULLEY BLOCK.

urmoynon rmm my 4, 1909.

Patented Sept. 13,1910.

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' UNITED STATES PATENT OFFICE.

AUGUSTUS SMITH, OF NORTH PLAINFIELD, NEW JERSEY, ASSIGNOR T0 BERGENPOINT IRON WORKS, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

PULLEY-BLOGK.

Specification of Letters Patent.

Patented Sept. 13, 1910.

Application filed May 4, 1909. Serial No. 493,844.

To all whom it may concern:

Be it known that I, AUGUs'rUs SMITH, a citizen of the United States ofAmerica, residing in the city of North Plainfield, in the county ofUnlon and State of New Jer sey, have invented an Improved Pulley- Block,of which the following is a specification.

The main object of my invention is to so construct the sheaves and mountthem in pulley blocks as to secure better lubrication, and the provisionof increased journal surface so that heavy loads can be carried by thesheave without increasing the pressure on the journal beyond the llmitsthat are necessary to insure proper lubrication and prevent undue wear.

Another object of my invention is to so arrange the mounting of thesheave that the wear does not increase progressively with continued use,but will increase no faster after the sheave has been in use for sometime than it does at the start.

A further object of my invention is to so arrange the mounting of thesheave that it is adequately supported in the lane of rotation, a thingwhich is not possi le with a sheave running loose on an axle in theusual way where the length of the journal is necessarily not much reaterthan the distance between the side pIates of the block.

Many of the advantages above noted are common to the customary mountingof a wheel on an axle which turns with it in fixed bearings as opposedto the mounting of a loose wheel on a fixed axle. The novelty of myinvention consists in applying the above principle to a sheave wheel ina pulley block and designing thecomponent parts so as to adapt them tothis service.

In the accompanying drawings Figure 1 is a transverse vertical sectiontaken through a sheave wheel in a pulley block; Fig. 2 is a. sideelevation of the same.

A is the sheave wheel scored usually for wire rope; B is the shaft oraxle which is forced tightly into the sheave so as to turn with it; C, Oare the side plates or cheek plates of the pulley block; D, D arejournals usually made of cast iron; and E, E are suitable anti-frictionbearings fitted into the journals D. These bearings reduce thefricoutward by springs H against the screw caps 1 The grease, therefore,is worn off by friction against the cap F as the axle turns and iscarried out through the journal, effecting complete lubrication. Thescrew cap F can be readily removed to put in new grease cartridges, orto renew the journal bearings; the length and diameter of the bearingsurface of the axle in the journal can be made to suit the load carriedby the sheave and are quite independent of the distance between thecheek plates C, C.

The sheave is held rigidly in the plane of rotation by virtue of thelong shaft or axle B. Heavy hanger straps J J reinforce the cheek platesC and transmit the load directly from the journal castings to the pin K,by which the pulley block is supported from some point above. If thepulley were hung in the bight of the hoisting rope a hook or link deending from the pin K would lift the loac. In either case the functionof the hanger straps J, J, would be the same. The cheek plates aresecured to the inner faces of the flanges (6 of the journals D, whilethe hanger straps J are secured to the outer faces of said flanges.

The journals may be lubricated through an oil hole as at L, or from anoil reservoir as at M, in addition to or instead of by the greasecartridges G.

I claim as my invention In a pulley block, an axle and sheave wheelmounted on the axle to turn with it, in combination with the cheekplates and hanger straps of the block, journals havin flanges to theinner faces of which are fixed said cheek plates, while to the outerfaces of the flanges are fixed the hanger straps.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses.

AUGUSTUS SMITH. Witnesses:

HUBERT I-IowsoN, WALTER Anon.

